Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61fd2b02ca5fbf6…

MALICIOUS

PDF

75.1 KB Created: 2021-09-22 13:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6255ce196d5c6e1f891e46ecacc0c7a8 SHA-1: 09aa91d49a2492b57cf88450cc582c43a03434d9 SHA-256: c61fd2b02ca5fbf6f292ee9074f9592891af5d80b4ae6ab25899ccd67ebc6b49
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with high confidence. It contains embedded JavaScript and a significant number of external URIs, many hosted on disposable domains, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://arhive.np-sp.ru/img/file/30368442602.pdf In PDF document text
    • http://coinproject.com/userfiles/image/file/wadadaraxomegiriga.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/nozediputuzezixipozix.pdfIn PDF document text
    • https://webmenuplus.com/images/file/tizuzodigulo.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/vovufisod.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/rokuxodebitoxanumafete.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/madunorofezavufojareza.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/defudazajakesaziduzexa.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/f2773eed7ae2ffc5bc1207b975be0507/43955933113.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/lebivizixugibup.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/xibovixo.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/34180233593.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/1359171208.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/wenumivire.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/88157071017.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/xibawatigifub.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/83727848771.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/bubedejogasanazuve.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/gexugikopopakujomadel.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/vozekigitugutidalob.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/4794565951.pdfIn PDF document text
    • https://basisangka.com/contents/files/75917360893.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161365425591ef---duxebusekavodujurutanug.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/depuku.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/fabipigenalowifib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+tv+tips+and+tricksPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD04 16308 bytes
SHA-256: e3efafdd867de33acb05bd4d7d87182dee7f9f577666f962fd1d4e2c9cda1133
font_02_sfnt_off000106f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F3 10468 bytes
SHA-256: 9cccbbc43d037a08be9b4b9e29b88288443a8827b387152d5d8a884c6093234c